Kenwood TKR-840 Service Manual
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Kenwood TKR-840 Service Manual

Kenwood TKR-840 Service Manual

Uhf fm repeater
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TKR-840
UHF FM REPEATER
SERVICE MANUAL
GENERAL ......................................................................... 2
SYSTEM SET-UP ............................................................. 2
INSTALLATION ................................................................. 3
OPERATING FEATURES ................................................. 4
REALIGNMENT .............................................................. 13
APPLICATION NOTE ..................................................... 15
CIRCUIT DESCRIPTION ................................................ 24
SEMICONDUCTOR DATA ............................................. 42
DESCRIPTION OF COMPONENTS ............................... 44
PARTS LIST .................................................................... 46
EXPLODED VIEW .......................................................... 61
PACKING ........................................................................ 63
TERMINAL FUNCTION .................................................. 64
Panel (Front)
LED
(A62-0726-03)
(830-2197-05)
LED
(830-0864-05)
CONTENTS
ADJUSTMENT ................................................................ 69
PC BOARD VIEW
CONTROL UNIT (X53-3880-10) ............................... 83
TX UNIT (X56-3050-XX) ........................................... 93
RX UNIT (X55-3060-XX) ......................................... 105
SCHEMATIC DIAGRAM ............................................... 111
BLOCK DIAGRAM ........................................................ 123
LEVEL DIAGRAM ......................................................... 125
INTERCONNECTION DIAGRAM ................................. 127
KES-4(EXTERNAL SPEAKER) .................................... 129
SPECIFICATIONS ....................................... BACK COVER
KENWOOD
©
1999-11 PRINTED IN JAPAN
B51-8506-00(S) 1534
PUSH KNOB (TEST)
(K29-3002-14)
LED ASSY
(LA301 DB)
LED
KNOB (VOL)
(830-2198-05)
(K29-4539-04)
MODULAR JACK
(E08-0876-05)

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  • Page 1: Table Of Contents

    KENWOOD TKR-840 UHF FM REPEATER SERVICE MANUAL © 1999-11 PRINTED IN JAPAN B51-8506-00(S) 1534 Panel (Front) PUSH KNOB (TEST) (A62-0726-03) (830-2197-05) (K29-3002-14) LED ASSY MODULAR JACK (830-0864-05) (LA301 DB) (E08-0876-05) KNOB (VOL) (830-2198-05) (K29-4539-04) CONTENTS GENERAL ................. 2 ADJUSTMENT ..............69 SYSTEM SET-UP .............

  • Page 2: General

    Merchandise received License and frequency allocated by FCC Frequency ran e (MHz) RF ower Type 450-480 Choose the type 100mWto 5W TKR-840 K of transceiver 480-512 100mWto 5W TKR-840 K2 400-430 100mWto 5W TKR-840 K3 RX modification See page 3...

  • Page 3: Installation

    TKR-840 ■ INSTALLATION RX MODIFICATION FOR EXTERNAL PRESELECTOR FILTER This model may be modified to use an external pre-selector filter. ® Remove the RX cover panel. Replace the screws on the RX unit and shield case, and the @ Remove the flat clip spring from IC4 and L 16 flat clip spring on IC4 and L 16.

  • Page 4: Operating Features

    TKR-840 ■ OPERATING FEATURES 1. Front Panel CD Speaker IJ) Programmable Function keys Press these keys to activate their ® REF (reference) indicator programmable functions. Lights red when using an external reference oscillator. Lights green when using the internal = = = PF1 PF2 PF3 oscillator.
  • Page 5 TKR-840 OPERATING FEATURES 3. Two 7-segment LED Displays • Channel display (1-32): while operating normally in User • "E2" displayed when the channel data is not written. Mode • "E3" displayed when PLL is unlocked . Receiver PLL is unlocked = flashing BUSY LED.
  • Page 6 TKR-840 OPERATING FEATURES 4. Programmable Functions TKR-840 contains many Programmable Functions tabled below. Programmable Function Description Channel 1-32 Directly select Channel 1 to 32, respectively. Channel Down The channel decrements by one. The channel increments by one. Channel Up AUX Out 1-6 Off AUX Out 1 to 6 ports become deactivated, respectively.
  • Page 7 Resets to default condition set up by FPU. No function. None • The following Programmable Functions are output functions used to tell the condition of the TKR-840 to an external device. • The output functions can be assigned to only AUX Outputs as follows. Programmable Function Description This function becomes valid if an RF carrier is present.
  • Page 8 TKR-840 OPERATING FEATURES 5. Trigger Assignment The Programmable Functions described above can be expresses that the LED in the PF Key turns on either assigned to PF Keys, AUX Input, and Start Up according to conditions. 'O' expresses that the trigger is available the following table.
  • Page 10 8.1 Multiple QT/DQT in the speaker audio. The TKR-840 can select the time between The TKR-840 can function as a multiple-QT/DOT decode/ 140 to 200 ms that the DQT turn-off code is sent. Typically this encode unit for operation as a community repeater or multiple­...
  • Page 11 Last Used, Selected + Talkback, Priority, Priority plus Talkback, 12. Intercom Operation and Selected. 1) Last Called : The TKR-840 reverts to the channel upon which The repeater has an Intercom feature which allows wireline a call was last received even if scanning has resumed (power communication between the dispatcher at the remote site and on default = selected channel).
  • Page 12 QT/DQT 21 . . Start Up received signal. When the TKR-840 is first turned on or is reset, up to 3 17. Take Over functions pre-programmed into the Start Up function are Take Over function is used to disable the remote wireline executed in sequence.

  • Page 13: Realignment

    TKR-840 REALIGNMENT 1. Modes User Mode PC Mode PC Programming Mode PC Test Mode PC Tuning Mode Firmware Programming Mode Function Mode Use this mode for normal operation. User Mode Use this mode to make various settings by means of the FPU through the RS-232C port.
  • Page 14 Set the firmware to be updated by File select (=F1 ). The KPG-46 is required to interface the TKR-840 to the Tum the TKR-840 power ON with the [PF 1] key held down. computer. It has a circuit in its D-subconnector (25-pin) Hold the key down for one second until the 7-segment case that converts the RS-232C logic level to the TTL level.

  • Page 15: Application Note

    TKR-840 APPLICATION NOTE 1. External 1/0 Connector Description 1.1. MICROPHONE jack Terminal Name Description Connector No Connection Power Source; 13.BV ± 15% / 0. 75A maximum PC Read/Write, PC Tuning, Firmware programming PTT (PC serial data from radio) MIC Ground...
  • Page 16 TKR-840 APPLICATION NOTE 1.3. CONTROL 1/0 jack Connector Terminal Name Description Level No Connection RXD2 (PC serial data to radio) PC Read/Write, PC Tuning, Remote *1 RS-232C Level TXD2 (PC serial data from radio) PC Read/Write, PC Tuning, Remote *1...
  • Page 17 TKR-840 APPLICATION NOTE TD ; TX Data input-transmit signalling (QT/ DOT/ L TR} The output logic level of all AUX O terminals (Section 1.3, input. (Impedance 600 n) 1 .4), including any AUX 1 / 0 programmed as "AUX Output"...
  • Page 18 TKR-840 APPLICATION NOTE AUX 1/0 6 and 7 can each be modified to sink up 600mA Change R320 for AUX 1/0 6 [R319 for AUX 1/0 7] of open collector current. The following modification should from 1kQ (RK73GB1J102J) to 0Q (R92-1252-05).
  • Page 19 TKR-840 APPLICATION NOTE 1.5 Connection to External Equipment Remote Termination(VEGA) Model 38-MAX (ZETRON) Raider(TRIDENT) Terminal RXD2 TXD2 (F1 to F8 optionally} AUXI 1 AUXI 2 (F1 to F8 optionally) (F1 to F8 optionally) AUXI 3 PTT Common CTCSS/DCS Encode TX Data Output...
  • Page 20 External Equipment 2.1. L TR Logic Controllers 1) Program the RX/TX channel frequency but do not set QT/ 4) Connect the 25-pin D-sub on TKR-840 to the interface port DQT tone/codes .. on L TR controller with a cable. 2) Edit the channel data by pressing [F1 O].
  • Page 21 AUX Input (prog. for Remote TX Disable) during Intercom The Intercom function allows two communications between operation. a dispatcher at a remote console and the TKR-840 unit at a <Edit>➔<Optional features>➔<AUX 1/0 Ports ... >➔ site via the remote termination unit-to-console audio link. This <AUX Input Functions (12-pin &...
  • Page 22 TKR-840 APPLICATION NOTE 3.1. Internal VO Terminal Description Description Level Tenninal Name 1 3 .8V Power Source 35mVrrns @ 3kHz Deviation TX audio output to optional board TX audio input from optional board 200mVrrns @ 1 kHz Mod 60% Dev...
  • Page 23 SPM line on the 25 Pin D-sub. local speaker, connect the board side tone output line to IC45, pin 2 (IC45 device: LA4422). The scrambler function is primarily designed for TKR-840 4. FPU Setting For Optional Board base station operation. However if used in repeater operation,...

  • Page 24: Circuit Description

    TKR-840 CIRCUIT DESCRIPTION 2.Transmitter Unit 1.0utline The TKR-840 is a UHF-band repeater operating in the 400- The transmitter unit (X56-305 A/3) consists of the following 430MHz and 450-512MHz frequency ranges. It has the circuits: (1) internal/external reference circuit, (2) transmitter...
  • Page 25 TKR-840 CIRCUIT DESCRIPTION C225 Q201 J 10. 2Mlh osc! C213 L205 C285 D201.202 FREQ. CONTROL '---;::======-.i__:;�-4--Q18. IC200 C204 SUB PLL CV "' R203 R209 � R202 IC201 §1 � --+--L201. Ql08 � ----+----- - --+--+--+- � � • ·� 2 = =' -+---- - Q 241 �...
  • Page 26 TKR-840 CIRCUIT DESCRIPTION 2.4 Transmitter main PLL circuit The transmitter main PLL circuit produces the transmitter PLL reference signal (4.5 MHz) and its phase is compared frequency signal and consists of VCO (Q1 and Q2) and a with the 1 00kHz comparison frequency. The phase difference single-chip PLL IC (IC101 ).
  • Page 27 TKR-840 CIRCUIT DESCRIPTION '" R109 Ra!ia �-..----ffi]DRV OUT QB. CUO?---'Vv\r �� ---«:J �I I•• swl � 1 .. AMPI �l " �I sw1TCHI �l l ,ND�ATOR I �l THEMAL SENSEi CN2(8T) Q17, ICI01(LOCX). !C200 Fig.5 Driver circuit 2.6 Modulation level adjustment circuit The level adjustment circuit adjusts the modulation signal using the FPU.
  • Page 28 TKR-840 CIRCUIT DESCRIPTION 2.7 Other circuits In addition, IC106 is an EEPROM. The transmitter JC301 R36I POWER MODULE adjustment data adjusted for each unit is written into the EEPROM. If the unit is installed in another set, it is not R304 necessary to adjust it again from the beginning, but only fine­...
  • Page 29 3.6 Common mode spurious filter circuit The APC circuit consists of differential amplifier IC302 (B/ The TKR-840 has a filter (L304) at the DC power line inlet 2), direct current amplifier 0301, analog switch IC304, and in the final unit to reduce common mode radiation from the switching transistors 0312 and 0313.
  • Page 30 TKR-840 CIRCUIT DESCRIPTION 4.Receiver Unit The receiver unit (X55-306) consists of the following circuits: (1) front-end circuit, (2) narrow IF circuit, (3) wide IF circuit, (4) receiver main PLL circuit, (5) receiver sub PLL circuit, (6) receiver DDS circuit, (7) baseband circuit, and (8) other circuits.
  • Page 34 TKR-840 CIRCUIT DESCRIPTION 4.5 Receiver sub PLL circuit The receiver sub-PLL circuit produces a second local oscillator signal for the receiver, and consists of PLL IC IC15, crystal oscillator X1, oscillator FET 021, buffer amplifier 023, RF amplifier 015, 030, 033, and emitter follower 027. The VCO consists of a crystal oscillator circuit (Q21 and X1) and varicap D9.
  • Page 35 TKR-840 CIRCUIT DESCRIPTION 4.7 Baseband circuit The baseband signal circuit consists of HPF 026, LPF 028, 028. The sub-audible components of the signal are removed D11, and 029. The base-band signals detected by the narrow by HPF 026, and the resulting signal is switched with a squelch FM and wide FM detection circuits are de-emphasized by LPF signal by D11 and 029, and output as an RA signal from CN6.
  • Page 36 TKR-840 CIRCUIT DESCRIPTION 5.1 Main CPU 5.Control Circuit The main CPU (IC17) is a 16-bit single-chip microcomputer Th� control unit (X53-388) consists of the following circuits: containing a 128k ROM and a 5k RAM. This CPU controls the (1) main CPU, (2) sub CPU, (3) DSP circuit, (4) AF PA circuit,...
  • Page 37 TKR-840 CIRCUIT DESCRIPTION 5.2 Sub CPU The sub CPU (IC18) is of the same type as the main CPU, but is programmed so that it operates as the sub CPU by connecting its pin 18 to GND (pin 18 of the main CPU is connected to Vdd.).
  • Page 38 TKR-840 CIRCUIT DESCRIPTION 5.3 DSP circuit The DSP circuit filters transmitter/receiver audio signals amplified by IC22 (B/2), fed to pin 6 (Vin R) of codec IC27, and and decodes signaling (QT, DOT). This circuit consists of IC30, converted from analog to digital at a sampling frequency of IC24, IC27, IC22, IC31, IC34, and IC25.
  • Page 39 TKR-840 CIRCUIT DESCRIPTION 5.4 AF PA circuit The AF PA circuit is an AF amplifier for driving speakers to test connector "SPO, SPG" on the rear panel. The impedance monitor received audio signals. This circuit consists of IC45. of the internal speaker is adjusted to provide an audio output The 4W audio output can be provided to an external 4 ohm of about 0.2 W when the internal speaker is used.
  • Page 40 TKR-840 CIRCUIT DESCRIPTION 5.6 Baseband circuit The baseband circuit switches between the modulation remote modulation input (RT A), and demodulation outputs signal to the transmitter unit, demodulation signal from the include receiver audio output (RA), receiver data output (RD), receiver unit, and remote audio signal and adjusts their levels.
  • Page 41 TKR-840 CIRCUIT DESCRIPTION 5.7 Microphone AGC circuit 5.9 Power supply circuit The microphone AGC circuit AGC-amplifies an audio signal The power supply circuit generates power to operate the coming from· a local microphone so that it does not overdrive CPU, DSP, flash ROM, bi-directional buffer, and baseband the modulator.

  • Page 42: Semiconductor Data

    TKR-840 SEMICONDUCTOR DATA IC17 MAIN CPU (30622M4-103GP) Pin No. Port name Function ■ A?-0 63-70 Flash memory/Sub CPU address bus Pin function DSP IDMA write output Pin No. Port name Function DSP IDMA read output HSDO High speed data output...
  • Page 43 TKR-840 SEMICONDUCTOR DATA Function Pin No. Port name Function Pin No. Port name Prag. 1/0 / Main CPU/ TX/ Rxcontrol,0:TX / 1 :RX Take over control output Interrupt Req. / pull up Local speaker output select IRQ2 RA output select...

  • Page 44: Description Of Components

    TKR-840 DESCRIPTION OF COMPONENTS CONTROL UNIT (X53-3880-10) RX UNIT (XSS-3060-XX) PIN.No Parts name DESCRIPTION PIN. No Parts name DESCRIPTION DOUBLE BALANCED MIXER MULTIPLEXER IC3~6 FLASH ROM IC10 VOLTAGE DETECTOR SHIFT REGISTER IC12,13 AF AMP MULTIPLEXER DC AMP IC14 BUS BUFFER...
  • Page 45 TKR-840 DESCRIPTION OF COMPONENTS TX UNIT (XS&-3050-XX) PIN.No Parts name DESCRIPTION PIN.No Parts name DESCRIPTION 0302,304,305 TRANSISTOR IC1,2 DC SWITCH DC AMP D/A CONVERTER 0306 TRANSISTOR SHIFT REGISTER 0307 TRANSISTOR DIFFERENTIAL AMP INVERTER 0308 TRANSISTOR DC SWITCH 0309 TRANSISTOR IC100...

  • Page 46: Parts List

    TKR-840 PARTS LIST L: Scandinavia K: USA P: Canada * New � arts. indicates safety critical components. Y: PX (Far East, Hawaii) T: England E: Europe Parts without Parts No. are not supplied. Y: AAFES (Europe) X: Australia M: Other Areas Les articles non mentionnes dans le Parts No.
  • Page 47 TKR-840 PARTS LIST CONTROL UNIT (X53-3810-10) Parts No. Ref. No. Address Description Destination Ref. No. Address Parts No. Description Destination parll parll CK73GB1E103K CHIPC O.OlOUF C192 CK73GB1E103K CHIPC O.OlOUF CK73EB1C105K CHIPC 1.0UF C193 CK73 FB1E104K CHIPC 0.10UF CK73GB1E103K CHIPC O.OlOUF...
  • Page 50 TKR-840 PARTS LIST CONTROL UNIT (X53-3880-10) RX UNIT (X55-3060-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R731.732 RK73GB1J102J CHIP R 1.0K 1/16W DTC114EUA DIGITAL TRANSISTOR R733 RK73G81J682J CHIP R 6.BK 1/16W...
  • Page 51 TKR-840 PARTS LIST RX UNIT (XSS-3060-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts CC73GCH1 H220J CHIP C 22Pf C83-85 CK73GB 1 H103K CHIP C 0 OIOUF K C34,35 CK73GB 1 H 102K...
  • Page 52 TKR-840 PARTS LIST RX UNIT (XSS-3060-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C156 CC73GCH 1 H040C CHIPC 4.0PF C236 C92-0589-05 CHIP -TAN 47U F 6.3WV C157 CK73GB1 Hl 02K CHIPC...
  • Page 55 TKR-840 PARTS LIST RX UNIT {XSS-3060-XX) TX UNIT {X56-3050-XX) Ref. No. Address Parts No. Description Destination Ref. No. Parts No. Description Address Destination parts parts SA7025DK ICIP LL SYSTEM) 83 0-2048-05 NJM78L05UA ICIVOLTA GE RE GULATOR/ +5VJ BU4094BC FV ICl8bit SHI FT/STORE RE GISTER)
  • Page 56 TKR-840 PARTS LIST TX UNIT (X56-3050-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts CK73G81H103K CHIP C 0.010UF K C135,136 C92-0628-05 CHIP -TAN lOUF lOWV CC73GCH 1 H040C CHIP C 4 OPF...
  • Page 57 TKR-840 PARTS LIST TX UNIT (X56-3050-XX) Ref. No. Address Description Parts No. Destination Ref. No. Address Parts No. Description Destination parts parts C260,261 CC73GCH 1 H100D CHIPC 10PF C330,331 CK73GB1H102K CHIPC 1000PF C262 CK73GB1 H103K CHIPC 0.010U F K C332,333...
  • Page 58 TKR-840 PARTS LIST TX UNIT (X56-3050-XX) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts l247 L40-1015-34 SMAL L FIXED INDUCTORl1 OOU H /8) R92-1245-05 CHIP R 1/2W L248 L40-4785-34 SMAL L FIXED INDUCTORl470 NH /8)
  • Page 59 TKR-840 TKR-840 PARTS LIST PARTS LIST TX UNIT (X56-3050-XX) TX UNIT (XSS-3050-XX) Ref. No. Address Address Destination Ref. No. Address Parts No. Description Destination Parts No. Description Destination Ref. No. Address Parts No. Description Destination Ref. No. Parts No. Description...
  • Page 60 TKR-840 TKR-840 PARTS LIST PARTS LIST TX UNIT (X56-3050-XX) TX UNIT (XSS-3050-XX) Ref. No. Address Address Destination Ref. No. Address Parts No. Description Destination Parts No. Description Destination Ref. No. Address Parts No. Description Destination Ref. No. Parts No. Description...

  • Page 61: Exploded View

    TKR-840 TKR-840 EXPLODED VIEW r� �. Parts with the exploded numbers larger than 700 are not supplied.

  • Page 62: Packing

    TKR-840 PACKING 45 DRESSED SCREW (N0S-0543-04) 6 INSTRUCTION MANUAL (862-1136-00) 23 FUSE (BLADE) (4A) (F06-4027-05) 38 PROTECTION BAG (H25-0029-04) 22 SQUARE PLUG 2 FRONT GLASS (E59-0410-05) (810-2590-04) 10 LEAD WIRE WITH CONNECTOR (E31-3228-05) 39 PROTECTION BAG (H25-0720-04) 36 POLYSTYRENE FOAMED FIXTURE...

  • Page 63: Terminal Function

    IKR- 840 TERMINAL FUNCTION CONTROL UNIT (X53-3880-10) h'"erminal Terminal rTerminal Terminal Terminal function Terminal function name name RX Audio (filtered signal) Local speaker input RX Audio ground Local speaker ground Detector audio AF volume control output Detector audio ground AF volume control input Noise squelch control Ground RSSI...
  • Page 64 TKR-840 TERMINAL FUNCTION CONTROL UNIT (X53-3880-10) !Terminal Terminal trerminal Terminal Terminal function Terminal function name name Speaker mute signal Remote RX signal (voice) AUX06 Auxiliary output 6 Remote TX signal (voice) Remote Press - to - talk switch RX signal ground...
  • Page 67 TKR-840 TERMINAL FUNCTION TX UNIT (XS&-3050-XX) CN307 terminal Terminal rrerminal Terminal Terminal function Terminal function name name RX Audio (filterd signal) Power supply ground RX Audio ground CN308 Detector audio DE G Detector audio ground lfermina Terminal Terminal function Noise squelch control...
  • Page 68 TKR-840 ADJUSTMENT est :qu1pment R equ1re • d f Al" •� nmen No. Test Equipment Major Specifications 1. Standard Signal Generator Frequency Range 340 to 520MHz. (SSG) Modulation Frequency modulation and external modulation. Output 0.1µV to greater than 1 mV.

  • Page 69: Adjustment

    TKR-840 ADJUSTMENT Adjustment Location RA RD TA TD •Top view DC 13.SV TX OUT EXT REF IN L31, CN3 □ �lslffil L28ffil lsl L27 lslffil ,:;---=' L3 9 ®I • L � 3 L41 !!il ffil gf □ 1 � CN4...
  • Page 70 TKR-840 ADJUSTMENT TEST FREQUENCY LIST TKR-840 K Factory use CH1 to CH16 Beat Power NOTE Frequency Frequency Shift 450.1000 450.0000 Wide A Low VCOA Low 457.6000 457.5000 Wide A Center VCO A Center 464.9000 464.9500 Wide A High VCOA High Wide 465.1000...
  • Page 71 TKR-840 ADJUSTMENT TKR-840 K2 Factory use C H1 to C H16 Beat Power NOTE Frequency Frequency Shift 480.1000 480.0000 Wide VCOALow A Low 488.1000 488.0000 Wide A Center VCOA Center 495.9000 495.9500 Wide A High VCOA High 496.1000 496.0000 Wide...
  • Page 72 TKR-840 ADJUSTMENT TKR-840 K3 Factory use CH1 to CH16 Beat Power NOTE Frequency Frequency Shift 400.0000 Wide A Low VCOA Low 400.1000 Wide A Center VCOA Center 407.6000 407.5000 Wide A High VCOA High 414.9000 414.9500 415.1000 415.0000 Wide Blow VCO B Low 422.5000...
  • Page 74 TKR-840 ADJUSTMENT i:IYUNIT Measurement Adjustment Specifications/ Item Condition Test Parts Method Remarks Unit Terminal Unit eaulpment 7. Analog 1) Connect the SSG to RX IN, then select the RXIN PC ADJ Squelch channel that the user will use (Wide) Audio,...
  • Page 76 TKR-840 ADJUSTMENT TY llt.llT Measurement Adjustment Specifications/ Item Condition Test Unit Terminal Unit Parts Method Remarks eauioment 17.TX Measure the power level at TX OUT. Power TX OUT PC ADJ ±0.1W Power 1) CH1 (Low) meter 5.0W (Hi) 2) CH4 (Center)

  • Page 77: Tx Unit (X56-3050-Xx)

    TKR-840 ADJUSTMENT TX UNIT Measurement Adjustment Specifications/ Item Condition Test Unit Terminal Unit Parts Method Remarks eciuipment 21.DQT 1) CH2 (VCO-A Center) MOD ANA TXOUT PC ADJ Balance 2) CHS (VC0-8 Center) Oscilloscope A/3 CONTROLl/0 Make the demodulated Adjust AG.f: SOHz (square wave)
  • Page 78 TKR-840 ADJUSTMENT TX UNIT Measurement Adjustment Specifications/ Item Condition Test Unit Unit Terminal Parts Method Remarks eciuipment 24.TA Dev 1) CH2 (VCO-A Center) MOD ANA TXOUT Check 3.0kHz±0.1 kHz Check 2) CHS (VCO-B Center) Oscilloscope A/3 CONffi0LV0 (Wide) AG.f: 1kHz...
  • Page 79 TKR-840 ADJUSTMENT TX UNIT Measurement Adjustment Specifications/ Item Condition Test Unit Terminal Unit Parts Method Remarks eciuipment 2S.QT Dev 1) CH2 (VCO-A Center) MOD ANA TX OUT Check 0.75kHz±0.05kHz Check 2) CHS (VCO-8 Center) Oscilloscope A/3 (Wide) QT: 151.4Hz LPF: 3kHz...
  • Page 80 TKR-840 ADJUSTMENT TX UNIT Measurement Adjustment Specifications/ Item Condition Test Unit Terminal Unit Parts Method Remarks eciuipment 33.Repeat 1) CH4 (Center Frequency) MOD ANA TX OUT PC ADJ Gain Level MOD: 1kHz Oscilloscope A/3 1kHz ±0.2kHz DEV: 1kHz Adjust (Wide) LEVEL: S01µV (-S3dBm)
  • Page 81 TKR-840 ADJUSTMENT BPF-wave Example :The wave will look like this when using a frquency WAT·tE.N O.r::IB RI.. -:1.8.QdlBm of 465,000 MHz "1 ···: CENTe:A .. !$!:I. OOM!-l:t SPAN 50 . 00MM>: MRBW 30KHZ 30i<HZ SWJS 2ooms MCF-wave (Wide) (Narrow) ..rTeN -30.0dBm...
  • Page 82 TK�-84� ......· · · · · ....... - ! ------'- ·...
  • Page 83 ■ TKR-840 PC BOARD VIEW · · · · · · · · · · · · · · 1 ······ · ········· t · CONTROL UNIT (X53-3880-10) (A/4) Foil Side View CONTROL UNIT (X53-3880-10) (A/4) Foil Side View Ref. NO.
  • Page 84 TKR-840 PC BOARD VIEW CONTROL UNIT (X53-3880-10) (A/4) Component Side CONTROL UNIT (X53-3880-10) (A/4) Component Side+ Foil Side View + Foil Side View Ref. NO. Address IC10 IC12 IC13 IC14 IC15 IC16 IC17 IC18 IC22 IC24 IC25 IC27 IC29 IC30...
  • Page 85 TKR-840 PC BOARD VIEW ······· ················· • ················· · · · · ..... ; ......·································i······································+······················· · ········ · ·······!'················ · · ······· · · ······· · ······t····· .•..•••••••..••••..······<·······································i················· · ········ · ········ · ·····!
  • Page 86 TKR-840 PC BOARD VIEW CONTROL UNIT (X53-3880-10) (C/4) Component Side View ················· t ······································ ......CONTROL UNIT (X53-3880-10) (D/4) Component Side View CO�UNIT • (X53-3880-10) (D/4) Component Side View Rel. NO. Address D700 D701 . . ··· · · · ·· ..
  • Page 87 TKR-840 PC BOARD VIEW ···············i·····································-!-················· · ··········· ·····•·········· TX UNIT (XSS-3050-XX) (A/3) Component Side View NJM78L05UA 2SK508NV(K52) TA75S01F SA7025DK 2SC3722K(S) TX UNIT (X56-3050-XX) (A/�) 2SK1824 2SC4215(Y) Component Side View Ref. NO. Address Ref.NO. Address Ref. NO. Address � D� E �...
  • Page 88 TKR-840 PC BOARD VIEW ------ f-----· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · • · • · · · · · · l · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · I · · · · • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · • · · · · · · · · · · · · · · · · + -· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · : • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • l · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · + · · · · · · · · · · · · · · · · · · · · · · · · · - --+ - - ·...
  • Page 89 TKR-840 PC BOARD VIEW TX UNIT (X56-3050-XX) (A/3) Component Side + Foil Side View ..-� ··········>·········· · ····· ...•..TX UNIT (X56-3050-XX) (A/3) NJM78L08UA 2SK302(Y) TA7808S NJM4558E 2SC3722K(S) SA7025DK NJM78L05UA Component Side + Foil Side View...
  • Page 90 TKR-840 PC BOARD VIEW ·······································>······•·····························+······••· • · ······· · · ······· · · ···--+----·············•··+····················································--- ·········· t ·· .. •••••••••••••••••••••••• ···················· l ······�---····----················ ·····---- ··--··························+·····································t·················· ·····•··················'.-······················--+- TX UNIT (X56-3050-XX) (B/3) (C/3) Component Side View L---·············+····································· ···• (C/3) 0-XX TX UNIT (X56-3050-XX) (B/3) Component Side View Ref.
  • Page 91 TKR-840 PC BOARD VIEW ·· ····················+···································· +························· TX UNIT (X56-3050-XX) (B/3) (C/3) Foil Side View �- - -: ............+ ........;................j ···...
  • Page 92 TKR-840 PC BOARD VIEW ____, __ · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · - --- •...

  • Page 93: Rx Unit (X55-3060-Xx)

    TKR- 840 . . . 1 PC BOARD VIEW RX UNIT {X55-3060-XX) Component Side View RX UNIT (X55-3060-XX) Component Side View Ref. NO. Address IC13 IC14 IC16 IC17 IC20 IC21 01· ·················· ····t··················· · ············· ····· ····i······································f························ ·········· ········· N�M;� � o� C �...
  • Page 94 RX UNIT (XSS-3060-XX) Foil Side View RX UNIT (X55-305 Foil Side View Ref. NO. Address IC10 IC11 IC12 IC15 IC18 IC19 IC22 IC23 2SC4081(R) 2SC3357 TC74HC14AF NJM4558E TA31137FN SA7025DK Component side E � 24 �12 .�to Pattern 1 '�, 20 � �- �...
  • Page 95 TKR-840 BOARD VIEW NJM78L08UA SA7025DK NJM78L05UA RX UNIT (X55-3050-XX) ......j �...

  • Page 96: Schematic Diagram

    TKR-840 SCHEMATIC DIAGRAM X53-38B0-10 A/4 CONTROL UNIT .- - ---- --· x:u-:1aeo-10 -·-·-·-·-· -· -·-·-·- - -·- -�•UD•l1,t-ol •�••·•�••-u,u.•1 ... �-•• _.,,..,, ... 010•.•o• ·-.u •IICIIH fll• DfCJH .. ,�,_,.. •-NL.It.I ,c,.,00., .. , • ..,,.. ,c,.... ,-c •...
  • Page 97 ___ v. ___ _ TKR-840 SCHEMATIC DIAGRAM XS6-3050-IH 8/3 IC30:l.303 DI0•-2•�-•n■ •U4''86 IC:tCM ,auo, 0"6 •DSll31MAI UT., I� ·-------------·- •WU:$ ,IOa <TA?IISOIP 1c101.ro2 DIO.&t·UO•UJ0-011 cu .•• , ·HC,722C(S) QII •aHL,Ml(U QI02.10,.,o,.101.11s. 1ca lOl•tJJMTILIMIUA IC200 <TCOIIJ Qfi.11'.1L2:a.11a.1u.1tes.ao, ,a111u, Qt:t •2K40H(U?) 201.ao12oti.a40·M2 ,asc-4:tU(Y) •�N4PP...
  • Page 98 TKR-840 SCHEMATIC DIAGRAM � :a.: � =- - -·-·-·-·--- ·-----------------·-------------- ·----------------------------------------------- •CIQ •CIII ..,ll � •;;.• �.:::,;: ___ � •UI �M--��-05 •Xf4 U4-4U■•O• �,..-GJ CJF" : .,,. ; I : • - _ : - _. ., .: . - - : ! --------------- ...

  • Page 99: Block Diagram

    TKR-8 40 TKR-84 0 BLOCK DIAGRAM •• WIT ,.�1-:,oeo-•� __ -----___ ------_ ----------- ---------------------___ ------_ -- _ ------ -------- ------------------- -------------------------- ----- -••> ..:II , ----- ----------------------- TX UtUT (X!le .JO!IO -------------------,. I CN>o■ ,OWIH•NOOULII 1--c:=====::J--� " c ,.. �...

  • Page 100: Level Diagram

    TKR-84 0 TKR-840 LEVEL DIAGRAM RX U�IT (XSS-3060-XXJ BOmVrm• 11o· m vrrna ICl 1 (B/2) 1ST LO I 7 O s:' rrns -114.0dBm z ____ C � l .---< - -t- _ --tt'H- __ -.. -"•,· , � i j w1DE IF STAGE ! if'""�"...

  • Page 101: Interconnection Diagram

    TKR -84 0 TKR -840 INTER CONN ECTION DIAGR AM POWER SUPPLY ----- -7 TX UNIT CN307 I --- X56-3050-** C/3 FUSE 4A -rn- RX UNIT CN306 TX UNIT r------ REP IN __________ CN3O1 X56-3050-** B/3 TX ANT RX ANT RX IN ---------.

  • Page 102: External Speaker)

    TKR-840 TKR-840 KES-4 (EXTERNAL SPEAKER) KPG-46 (PROGRAMMING INTERFACE CABLE) KPG-46 External view KES-4 1 ead 1 2 � Crimp terminal (E23-0613-05) Black/White lead ■When using an external speaker : 1. Make sure the unit's power is turned OFF. 3. When not using the external speaker, replace the jumper 2.
  • Page 103 TKR-840 MEMO ..: . · . . .

  • Page 106: Specifications

    60dB (at 100mW) FM Noise ..... ; ............Wide : 55dB, Narrow : 50dB KENWOOD follows a policy of continuous ad ".' ancement in development. For this reason specifications may be changed without notice. KENWOOD CORPORATION 14-6, Dogenzaka 1-chome, Shibuya-ku, Tokyo 150-8501, Japan KENWOOD SERVICE CORPORATION KENWOOD ELECTRONICS EUROPE B.V.

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